back button not working

hi guys ,
i have developed a website which works fine in one server but not working in another server.
the problem is i have a back button which goes to another program
here is the code:
[php]
if ($back == "Back") {
header("Location:a_user_outline.php");
}
<td align="center"><input type="submit" name="back" value="back" size="40" ?>">[/php]
the server which works fine has the following version
php 4.4.4
mysql 4.1.22-standard
apache 1.3.37

the server which doesn't work has the following version
php 4.4.8
mysql 4.1.22-standard
apache 2.0.63

cud anyone help me

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re: back button not working

Hi. I think the problem is in register_globals option. Try this:
[php]
if ($_REQUEST['back'] == "Back") {
header("Location:a_user_outline.php");
}
<td align="center"><input type="submit" name="back" value="back" size="40" ?>">[/php]

And note that string "Back" is not equal to "back".